Method for detecting projectile impact location and velocity vector
a projectile impact and velocity vector technology, applied in the field of sensors, can solve the problems of inadvertent shortening of the two separated conductive layers, adding to the overall troubleshooting and maintenance costs of the sensor, and electrical sensors can also generate inadvertent sparks, and achieve the effect of inexpensive optical sensors
Inactive Publication Date: 2007-03-27
THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE
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- Abstract
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Benefits of technology
[0007]It is an object of the present invention to provide an inexpensive optical sensor.
[0008]It is a further object of the present invention to provide an optical sensor that does not require power.
[0009]It is another object of the present invention to provide an optical sensor that does not require an external light source.
[0014]It is still another object of the present invention to provide a passive optical sensor structure for reliably detecting the trajectory of more than one projectile in succession.
Problems solved by technology
However, present electrical penetration sensors detect penetration of the sensor by a projectile via electrical shorts in the sensor.
One of the drawbacks of electrical sensors is the problem of inadvertent shorts of the two separated conductive layers.
This adds to the design, installation, and the overall troubleshooting and maintenance costs of the sensor.
Electrical sensors can also generate inadvertent sparks, which in some applications, where explosives might be nearby, is highly undesirable.
Electrical sensors are also subject to electrical noise that is generated from electromagnetic interference.
Noisy electrical signals can be difficult to interpret and can cause erroneous indication of penetration events.
Another drawback of using electrical sensors is that the passing projectile can short out the signal cable.
This event can erroneously be interpreted as a penetration event at the sensor or, even worse, short out the power supply and cause erroneous readings on other sensors that are connected to the same system.
Electrical sensors have also proven to be susceptible to chemicals, which limits their applications.
One disadvantage of this type of sensor is that a fine and precise layout of many optical elements is needed to achieve a fine spatial resolution of the impact point.
In addition, such active layouts of optical fibers are expensive to manufacture.
They do not directly provide additional details on the trajectory of the projectile or other penetration characteristics of the projectile.
In addition, both methods discussed above degrade significantly as projectile damage accumulates in multiple projectile scenarios.
In the case of the electrical detection panels, a penetrating fragment will often leave the panel shorted out.
Once a panel is shorted, it cannot detect the penetration of subsequent projectiles.
These systems are expensive to purchase and operate and are limited in use to very specific applications.
Method used
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[0002]This invention was made with U.S. Government support under Navy contract no. N00024-98-D-8124. The U.S. Government has certain rights in the invention.
BACKGROUND OF THE INVENTION
[0003]The present invention relates to sensors and in particular to optical sensors. There are both electrical and optical sensors capable of sensing pressure, stress, and penetration of objects. However, present electrical penetration sensors detect penetration of the sensor by a projectile via electrical shorts in the sensor. The penetrating projectile creates the short between two separated conductive layers. This short can be sensed and used to identify a penetration. One of the drawbacks of electrical sensors is the problem of inadvertent shorts of the two separated conductive layers. The conductive layers must be insulated from each other and the other conductive parts of the sensor and from the structure on which the sensor is mounted. This adds to the design, installation, and the overall troub...
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A method of determining the path of a projectile comprises detecting multiple time of arrivals of the projectile in multiple intersecting planes and determining the path and speed of the projectile based on the multiple times of arrivals.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional of allowed, U.S. application Ser. No. 10 / 485,079, filed Jan. 27, 2004, now U.S. Pat. No. 6,931,166 which is a national stage of international application PCT / US02 / 34377, filed Oct. 25, 2002, which claims the benefit of U.S. provisional application No. 60 / 343,724, filed Oct. 25, 2001, each of which is hereby incorporated by reference in its entirety.STATEMENT OF GOVERNMENTAL INTEREST[0002]This invention was made with U.S. Government support under Navy contract no. N00024-98-D-8124. The U.S. Government has certain rights in the invention.BACKGROUND OF THE INVENTION[0003]The present invention relates to sensors and in particular to optical sensors. There are both electrical and optical sensors capable of sensing pressure, stress, and penetration of objects. However, present electrical penetration sensors detect penetration of the sensor by a projectile via electrical shorts in the sensor. The penetrating proj...
Claims
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IPC IPC(8): G02B6/00F41J5/02G01P3/68
CPCF41G3/142G01P3/685F41J5/02
InventorGAUTHIER, JR., LEO R.DREWRY, JR., DAVID G.BRUNNER, LEROY
OwnerTHE JOHN HOPKINS UNIV SCHOOL OF MEDICINE